JP2019048535A - Body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body structure capable of ensuring continuity of a closed cross section of a dash cross member. SOLUTION: A vehicle body structure 1 includes a dash cross member 40 provided on a dash lower panel 10 to form a closed cross section extending in the vehicle width direction, and a groove provided in a central portion of a vehicle compartment 2 in a vehicle width direction and opening downward. A floor tunnel 20 having a shape extending in the front-rear direction, a corner patch 30 extending in the front-rear direction along the ridgeline portions 23 and 24 of the floor tunnel 20 on the outdoor side of the floor tunnel 20, a dash cross member 40, and a corner. The patch 30 and the first joining portion 60 that joins the front end portions to each other. The dash cross member 40 is continuously provided on the vehicle compartment 2 side of the floor tunnel 20 from the floor tunnel 20 toward both sides in the vehicle width direction. The floor tunnel 20 includes a front extension portion 20a that extends forward of the first joint portion 60. [Selection diagram] Figure 1

Description

  The present invention relates to a vehicle body structure.

  For example, Patent Document 1 discloses a vehicle body structure including a dash cross member provided in a dash lower panel and extending in the vehicle width direction, and a floor tunnel provided in the vehicle width direction center of a vehicle compartment and extending in the front and rear direction. Is disclosed. The dash cross member of Patent Document 1 includes a panel closed cross section forming member which forms a closed cross section in cooperation with the dash lower panel on both sides in the vehicle width direction of the floor tunnel and a tunnel closed which cooperates with the floor tunnel to form a closed cross section. And a closed cross section extending in the vehicle width direction.

International Publication No. 2016/148057

  In the related art, while the panel closed section forming member is provided on the side of the dash lower panel on the side of the vehicle compartment, the tunnel closed section forming member is provided on the side opposite to the compartment of the floor tunnel. Are not directly connected. For this reason, the continuity of the closed cross section of the dash cross member was impaired at the floor tunnel.

  The present invention is made in view of the above-mentioned point, and an object of the present invention is to provide a vehicle body structure which can secure continuity of a closed cross section of a dash cross member.

  In order to achieve the above object, a vehicle body structure according to the present invention is provided on a front wall portion of a vehicle compartment, and includes a dash cross member forming a closed cross section extending in the vehicle width direction; A floor tunnel provided in the center and extending downward and having a groove shape extending in the front-rear direction, a corner patch extending in the front-rear direction along the ridge of the floor tunnel outside the floor tunnel, And a first joint portion joining front end portions of the dash cross member and the corner patch. The dash cross member is provided continuously from the floor tunnel toward both sides in the vehicle width direction on the vehicle cabin side of the floor tunnel. The floor tunnel may include a front extension that extends forward of the first junction.

  According to the vehicle body structure of the present invention, the continuity of the closed cross section of the dash cross member can be secured.

FIG. 1 is a perspective view of a vehicle body structure according to an embodiment of the present invention as viewed from the rear right. It is a rear view which looked at a vehicle body structure from the rear side. It is the bottom view which looked up at the vehicle body structure from the lower side. FIG. 3 is a partially enlarged rear view of FIG. 2; FIG. 5 is a vertical cross-sectional view taken along line V-V in FIG. 4. FIG. 6 is a vertical cross-sectional view taken along the line VI-VI in FIG. 3; It is a vertical sectional view in the VII-VII arrow of FIG. It is a vertical sectional view in the VIII-VIII arrow of FIG.

  Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. The same reference numerals are given to the same components and redundant description will be omitted. When explaining the direction, it will be described based on front, rear, left, right, upper and lower as seen from the driver. Also, "vehicle width direction" is synonymous with "left and right direction".

  As shown in FIG. 1, an automobile V including a vehicle body structure 1 according to the embodiment includes a dash lower panel 10, a floor tunnel 20, a corner patch 30, and a dash cross member 40.

  The dash lower panel 10 is a member that forms the front wall of the passenger compartment 2. That is, the dash lower panel 10 is a plate-like member that divides the power source device chamber 3 on the front side and the compartment 2 on the rear side, and is formed by bending a steel plate into a predetermined shape by press molding, for example. The dash lower panel 10 includes an upper and lower wall 11 extending in the vertical direction and the vehicle width direction, an inclined wall 12 extending downward and downward from the lower end of the upper and lower wall 11, and a pair of wheel arches formed at both ends in the vehicle width direction. And a shape portion 13 (only the left side is shown in FIG. 1). In the following description, a portion other than the wheel arch-shaped portion 13 of the dash lower panel 10 may be referred to as a “general portion 14”.

  The dash lower panel 10 has a dash flange portion 17 extending rearward from the outer end in the vehicle width direction. The dash flange portion 17 is formed across the upper and lower wall 11, the wheel arch-shaped portion 13 and the inclined wall 12. The side sill 80 and the front pillar lower 90 are joined to the dash flange portion 17. The floor panel 50 is joined to the lower end of the inclined wall 12. The floor panel 50 extends substantially horizontally rearward from the lower end of the sloped wall 12. The floor panel 50 corresponds to the “front and rear walls” in the claims.

  The wheel arch shaped portion 13 is a portion that constitutes a part of a wheel arch (not shown) covering the upper half of the front wheel of the vehicle V. The wheel arch-shaped portion 13 is formed in a spherical shape that bulges toward the compartment 2 side, and is provided so as to straddle the upper and lower wall 11 and the inclined wall 12. The ridgeline portion 15 which is a boundary between the wheel arch-shaped portion 13 and the general portion 14 (mainly the upper and lower walls 11) shown in FIG. 2 is a broken line (ridgeline) formed by bending the dash lower panel 10 and has a substantially circular shape in rear view It is extended in an arc. The dash lower panel 10 has a concave notch 16 that opens downward at the center in the vehicle width direction. The notch portion 16 is formed across the upper and lower walls 11 and the inclined wall 12.

  The floor tunnel 20 is configured separately from the dash lower panel 10, and is a member provided at a central portion in the vehicle width direction of the passenger compartment 2. The floor tunnel 20 is joined to the vehicle width direction central portion (notched portion 16) of the dash lower panel 10. The floor tunnel 20 is a member that is formed by bending in a groove shape (tunnel shape, inverted U-shape) that is open downward and convex upward, and is extended in the front-rear direction. The floor tunnel 20 extends continuously from the upper and lower walls 11 through the inclined walls 12 to the floor panels 50 which are front and rear walls. A propeller shaft, an exhaust pipe and the like (not shown) are accommodated inside (below) the floor tunnel 20. The floor tunnel 20 is composed of two members, a front floor tunnel 21 disposed on the front side and a rear floor tunnel 22 disposed on the rear side of the front floor tunnel 21.

  As shown in FIG. 4, the front floor tunnel 21 is a member formed by, for example, bending a steel plate into a groove shape that opens downward by press molding. The front floor tunnel 21 includes a front tunnel upper wall portion 21a constituting an upper wall, and a front tunnel left wall portion 21b and a front tunnel right portion extending downward from left and right ends of the front tunnel upper wall portion 21a to constitute side walls. A wall portion 21c and a front tunnel flange portion 21d formed by bending the front end portion and the lower end portion of the upper wall and the side wall are provided.

  The front tunnel upper wall portion 21a is inclined to be positioned upward as it goes forward. In the present embodiment, the front tunnel left wall 21b and the front tunnel right wall 21c are formed flat. The front tunnel flange portion 21 d is joined to the edge of the cutout portion 16. A front tunnel left ridge line portion 21e which is a ridge line on the left side is extended in the front-rear direction by a bent portion in which the front tunnel upper wall portion 21a and the front tunnel left wall portion 21b are continuous. Further, a front tunnel right edge line portion 21f which is a ridgeline on the right side is extended in the front-rear direction by a bent portion in which the front tunnel upper wall portion 21a and the front tunnel right wall portion 21c are continuous.

  The rear floor tunnel 22 is a member that constitutes the main body of the floor tunnel 20. The rear floor tunnel 22 is, for example, a member formed by bending a steel plate into a groove shape opened downward by press molding, and extends substantially horizontally. The rear floor tunnel 22 includes a rear tunnel upper wall 22a constituting an upper wall and a rear tunnel left wall 22b extending downward from left and right ends of the rear tunnel upper wall 22a to constitute a side wall. And a rear tunnel right wall 22c, and a rear tunnel flange 22d bent at the lower end of the side wall.

  The front end portion side of the rear side tunnel upper wall portion 22a is inclined so as to be positioned upward toward the front. In the present embodiment, the rear side tunnel left wall portion 22b and the rear side tunnel right wall portion 22c are formed flat. The rear tunnel flange portion 22 d is joined to the edge of the notch 16 and the vehicle width direction inner end of the floor panel 50. A rear tunnel left ridge line 22e, which is a ridge on the left side, is extended in the front-rear direction by a bent portion in which the rear tunnel upper wall 22a and the rear tunnel left wall 22b are continuous. Further, a rear tunnel right ridge line portion 22f which is a ridgeline on the right side is extended in the front-rear direction by a bent portion in which the rear tunnel upper wall portion 22a and the rear tunnel right wall portion 22c are continuous. In the following description, the front side tunnel left side portion 21e and the rear side tunnel left side portion 22e are collectively referred to as "tunnel left side portion 23", and the front side tunnel right side portion 21f and the rear side tunnel right side portion 22f are together. May be referred to as “tunnel right ridge line portion 24”.

  The front floor tunnel 21 is formed to have lower compressive strength than the rear floor tunnel 22 against a collision load from the front, for example, by selection of material, plate thickness, reinforcing structure, through holes and the like. As an example, the front floor tunnel 21 may be formed of a single general steel plate, and the back floor tunnel 22 may be formed of a high-tensile steel plate to give both strengths of compressive strength.

  The front floor tunnel 21 is formed to have lower strength than the dash lower panel 10 against a collision load from the front, for example, by selection of the material, the plate thickness, the reinforcing structure, the through hole and the like. At the time of a collision of a vehicle, the front floor tunnel 21 absorbs collision energy by being crushed in the front-rear direction by the collision load.

  As shown in FIG. 5, the rear end of the front floor tunnel 21 is superimposed on the front end of the rear floor tunnel 22 and joined by welding or the like. Thus, the second joint 70 in which the front floor tunnel 21 and the rear floor tunnel 22 are joined is formed. The second joint 70 is provided rearward of the front end 40 a of the dash cross member 40. Conversely, the front end 40 a of the dash cross member 40 is located forward of the second joint 70. More specifically, the entire dash cross member 40 (central cross member 41) is provided in front of the second joint 70. The second joint portion 70 may be provided at a position corresponding to the dash cross member 40 in the front-rear direction (for example, a position corresponding to a front end portion, a closed cross section, a rear end portion or the like of the dash cross member 40).

  As shown in FIG. 3, the corner patch 30 is a member extending in the front-rear direction along the left and right ridge portions 23 and 24 of the floor tunnel 20 on the opposite side (the outdoor side) of the floor tunnel 20 to the cabin 2. is there. The corner patch 30 includes a left corner patch 30A extending along the tunnel left edge portion 23 and a right corner patch 30B extending along the tunnel right edge portion 24. Each corner patch 30A, 30B is formed, for example, by bending a steel plate into a predetermined shape by press molding. In the following description, the surface of the floor tunnel 20 opposite to the passenger compartment 2 may be referred to as the “rear surface”.

  The left corner patch 30A is divided into a left front corner patch 31 and a left rear corner patch 32 in the front-rear direction.

  The left front corner patch 31 is provided straddling the front floor tunnel 21 and the rear floor tunnel 22. The front end portion of the left front corner patch 31 is extended to the vicinity of the front-to-rear intermediate portion of the front floor tunnel 21 beyond the second joint portion 70 where the front floor tunnel 21 and the rear floor tunnel 22 are joined. . In the second bonding portion 70, the left front corner patch 31 is also bonded (three-piece bonding) to the front floor tunnel 21 and the rear floor tunnel 22.

  The left front corner patch 31 shown in FIG. 6 has a left front patch upper wall 31a constituting an upper wall, a left front patch side wall 31b constituting a side wall, and an outer end in the vehicle width direction of the left front patch upper wall 31a. And a left front patch connector 31c connecting the upper front end of the left front patch sidewall 31b. The front left patch upper wall 31a is joined to the back of the front tunnel upper wall 21a and the rear tunnel upper wall 22a (see FIG. 3) by welding or the like. The left front patch sidewall 31b is joined to the back of the front tunnel left wall 21b and the back tunnel left wall 22b (see FIG. 3) by welding or the like. The left front patch connector 31 c obliquely extends between the left front patch upper wall 31 a and the left front patch sidewall 31 b and is separated from the back surface of the floor tunnel 20.

  As shown in FIG. 5, the left rear corner patch 32 is disposed behind the left front corner patch 31. The front end portion of the left rear corner patch 32 is overlapped with the rear end portion of the left front corner patch 31 and joined by welding or the like. The left rear corner patch 32 has substantially the same configuration as the left front corner patch 31 and includes a left rear patch upper wall 32a constituting an upper wall, a left rear patch sidewall 32b constituting a side wall, and a left A left rear patch connecting portion 32c is provided which connects the vehicle width direction outer end portion of the rear patch upper wall portion 32a and the upper end portion of the left rear patch side wall portion 32b. The left rear patch upper wall portion 32a is joined to the rear surface of the rear tunnel upper wall portion 22a by welding or the like. The left back patch side wall 32b is joined to the back of the back tunnel left wall 22b by welding or the like.

  As shown in FIG. 3, the right corner patch 30B is divided into a front right corner patch 33 and a rear right corner patch 34 in the front-rear direction.

  The right front corner patch 33 is provided straddling the front floor tunnel 21 and the rear floor tunnel 22. The front end portion of the right front corner patch 33 is extended to the vicinity of the front-to-rear intermediate portion of the front floor tunnel 21 beyond the second joint portion 70 where the front floor tunnel 21 and the rear floor tunnel 22 are joined. . In the second bonding portion 70, the right front corner patch 33 is also bonded (three-piece bonding) to the front floor tunnel 21 and the rear floor tunnel 22.

  The right front corner patch 33 shown in FIG. 6 includes the right front patch upper wall 33a constituting the upper wall, the right front patch sidewall 33b constituting the side wall, and the outer end of the right front patch upper wall 33a in the vehicle width direction. And a right front patch connector 33c connecting the upper front end of the right front patch sidewall 33b. The right front patch upper wall portion 33a is joined to the back surfaces of the front tunnel upper wall portion 21a and the rear tunnel upper wall portion 22a (see FIG. 3) by welding or the like. The right front patch sidewall portion 33b is joined by welding or the like to the back surface of the front tunnel right wall 21c and the rear tunnel right wall 22c (see FIG. 3). The right front patch joint portion 33 c obliquely extends between the right front patch upper wall portion 33 a and the right front patch sidewall portion 33 b, and is separated from the back surface of the floor tunnel 20.

  As shown in FIG. 3, the right rear corner patch 34 is disposed behind the right front corner patch 33. The front end portion of the right rear corner patch 34 is overlapped with the rear end portion of the right front corner patch 33 and joined by welding or the like. The right rear corner patch 34 has substantially the same configuration as the right front corner patch 33, and although not shown, the right rear patch upper wall constituting the upper wall and the right rear patch sidewall constituting the side wall And a right rear patch coupling portion connecting the vehicle width direction outer end portion of the right rear patch upper wall portion and the upper end portion of the right rear patch sidewall portion. The right rear patch upper wall portion is joined to the rear surface of the rear tunnel upper wall portion 22a by welding or the like. The right rear patch side wall portion is joined to the back surface of the rear tunnel right wall 22c by welding or the like.

  As shown in FIG. 7, the left front corner patch 31 extends along the position corresponding to the inclined wall 12. The left rear corner patch 32 extends from the position corresponding to the inclined wall 12 to the position corresponding to the floor panel 50 which is the front and rear wall. That is, the left corner patch 30A continuously extends from the position corresponding to the inclined wall 12 to the position corresponding to the floor panel 50. The rear end portion of the left corner patch 30A reaches near the front seat support cross member 100 extending in the vehicle width direction. Although illustration is omitted, similarly, the right front corner patch 33 extends along the position corresponding to the inclined wall 12, and the right rear corner patch 34 also corresponds to the floor panel 50 from the position corresponding to the inclined wall 12. Extends to the position where That is, the right corner patch 30B also extends continuously from the position corresponding to the inclined wall 12 to the position corresponding to the floor panel 50. The rear end of the right corner patch 30B also reaches near the front sheet support cross member 100.

  As shown in FIGS. 2 and 8, the dash cross member 40 is a framework member provided on the dash lower panel 10 and the floor tunnel 20 and constituting a closed cross section extending in the vehicle width direction. The dash cross member 40 includes a central cross member 41 and a pair of left and right side cross members 42 and 42. That is, the dash cross member 40 is configured by connecting the central cross member 41 and the side cross members 42 and 42 in the vehicle width direction.

  The central cross member 41 is a member that cooperates with the front floor tunnel 21 to form a closed cross section. The central cross member 41 is joined to the surface of the front floor tunnel 21 on the side of the passenger compartment 2. The central cross member 41 is joined to the rear side of the front floor tunnel 21. The central cross member 41 is formed, for example, by bending a steel plate into an inverted U shape by press molding. The central cross member 41 shown in FIG. 4 is joined to the central upper wall portion 41a joined to the surface of the front tunnel upper wall portion 21a on the cabin 2 side and to the surface on the cabin 2 side of the front tunnel left wall portion 21b. Of the central left wall 41b, the central right wall 41c joined to the surface of the front side tunnel right wall 21c on the compartment 2 side, and the convex surface of the compartment 2 side, and the opposite side to the compartment 2 And a central bead shaped portion 41d in which the surface (surface on the front floor tunnel 21 side) is concave.

  The central bead shaped portion 41 d is continuously formed over the entire length in the vehicle width direction at the central portion in the front-rear direction of the central cross member 41. When the central cross section 41 is joined to the front floor tunnel 21, the central bead shaped portion 41d is separated from the surface of the front floor tunnel 21 on the side of the compartment 2 to form a closed cross section C1 (see FIG. 6). The closed cross section C1 is continuous in the vehicle width direction from the front tunnel left wall 21b to the front tunnel right wall 21c through the front tunnel upper wall 21a.

  The side cross members 42, 42 shown in FIG. 4 are members that mainly form a closed cross section in cooperation with the dash lower panel 10. The side cross members 42, 42 are joined to the surface of the dash lower panel 10 on the vehicle compartment 2 side on both sides of the floor tunnel 20 in the vehicle width direction. The side cross member 42 is formed, for example, by bending a steel plate into an L shape by press molding. Side cross member 42 includes side lateral wall portion 42a extending in the front-rear direction and vehicle width direction, and an end portion on the inner side (floor tunnel 20 side) of lateral side wall portion 42a in the vehicle lateral direction to the side wall of floor tunnel 20 The side flange portion 42b extending to the side of the vehicle compartment 2 along the side, the surface on the side of the vehicle compartment 2 is convex, and the surface on the opposite side of the compartment 2 (the surface on the side of the dash lower panel 10) is concave And a side bead shape portion 42c.

  The side bead shaped portion 42 c is continuously formed over the entire length in the vehicle width direction at the center in the front-rear direction of the side cross member 42. When the side cross member 42 is joined to the dash lower panel 10, the side bead shape portion 42c is separated from the surface of the dash lower panel 10 on the vehicle compartment 2 side to form a closed cross section C2 (see FIG. 6). The closed cross section C2 extends in the vehicle width direction on both sides of the floor tunnel 20 in the vehicle width direction.

  The side lateral wall portion 42a is joined to the inclined wall 12 of the dash lower panel 10 by welding or the like on the front and rear sides of the side bead shape portion 42c. The side flange portion 42 b is joined to the side wall of the front floor tunnel 21 by welding or the like. When the side cross-member 42 is joined to the front floor tunnel 21, the side bead-shaped portion 42c of the side flange portion 42b is separated from the surface of the front floor tunnel 21 on the vehicle compartment 2 side to close the closed cross section C3 (see FIG. 6) form. That is, the side cross member 42 also forms a closed cross section with the front floor tunnel 21 in the present embodiment. The center cross member 41 extends outward in the vehicle width direction without the side flange portion 42b being omitted and the side cross member 42 does not form a closed cross section with the front floor tunnel 21 and the dash lower panel 10 and A closed cross section may be formed between the two.

  As shown in FIGS. 2 and 8, the central cross member 41 is joined to the surface of the front floor tunnel 21 on the side of the cabin 2. On the other hand, the side cross member 42 is joined to the surface of the dash lower panel 10 on the vehicle compartment 2 side. The lateral end of the central cross member 41 in the vehicle width direction is overlapped with the lateral end of the side cross member 42 in the lateral direction of the vehicle, and joined by welding or the like. The lateral end of the side cross member 42 in the vehicle width direction reaches near the lateral end of the wheel arch-shaped portion 13 (the ridge line portion 15) in the vehicle width direction. Thus, the dash cross member 40 is continuously provided from the floor tunnel 20 on both sides in the vehicle width direction on the cabin 2 side of the floor tunnel 20. In other words, the dash cross member 40 extends continuously in the vehicle width direction across the floor tunnel 20 on the side of the cabin 2. The closed cross section C1 formed by the central cross member 41 is continuous with the closed cross sections C2 and C3 formed by the side cross members 42. That is, one closed cross section extending continuously in the vehicle width direction is formed by the closed cross section C1 and the closed cross sections C2 and C3.

  Here, with reference to FIG. 5, the front end portion 40a of the dash cross member 40 and the peripheral configuration thereof will be described in more detail. The central upper wall portion 41a of the central cross member 41 is joined (three joined) to the left front patch upper wall portion 31a via the front tunnel upper wall portion 21a on the front side of the central bead shape portion 41d. The right front patch upper wall portion 33a is also joined (three joined) (not shown). Thus, the first joint portion 60 in which the front end portions of the dash cross member 40 and the corner patch 30 are joined is formed. The first joint portion 60 is located rearward of the front end 40 a of the dash cross member 40 and the front end 30 a of the corner patch 30.

  Reference L shown in FIG. 5 indicates a reference line orthogonal to the extending direction of the dash cross member 40 and passing through the front end 40 a of the dash cross member 40. The front end 30a of the corner patch 30 may be disposed at the same position as the reference line L as shown in FIG. 5, or may be disposed rearward of the reference line L (the front end 40a of the dash cross member 40). . The floor tunnel 20 includes a front extension 20 a extending forward of the front end 40 a of the dash cross member 40. The front extension 20 a extends forward of the first joint 60. The front extension 20a is formed across the front tunnel upper wall 21a, the front tunnel left wall 21b, the front tunnel right wall 21c, and the front tunnel flange 21d (see FIG. 4).

  The vehicle body structure 1 according to the present embodiment is basically configured as described above. Next, the function and effect of the vehicle body structure 1 will be described.

In the present embodiment, as shown in FIG. 2 and FIG. 8, the dash cross member 40 is provided continuously from the floor tunnel 20 on both sides in the vehicle width direction on the cabin 2 side. Can be made continuous, and continuity of the closed cross section of the dash cross member 40 can be secured. Thereby, the rigidity of the closed cross section of the dash cross member 40 can be enhanced.
Further, as shown in FIG. 5, the front end portions of the dash cross member 40 provided on the side of the floor tunnel 20 on the side of the compartment 2 and the corner patch 30 provided on the outdoor side (the side opposite to the compartment 2) Since joining is performed by the first joint portion 60, the backward movement of the dash cross member 40 in the vicinity of the floor tunnel 20 can be suppressed at the time of a frontal collision. Thereby, the deformation of the foot space of the passenger compartment 2 can be suppressed.
Further, as shown in FIG. 5, since the floor tunnel 20 is provided with the front extending portion 20a extending forward than the rigid first joint portion 60, the front extension 20a is positively crushed at the time of the front collision to generate collision energy. It can be absorbed.

  Further, in the present embodiment, as shown in FIG. 5, the front extending portion 20 a extends forward of the front end 40 a of the dash cross member 40, and the front end 30 a of the corner patch 30 is the dash cross member 40. It is arranged at the same position as the front end 40a of the. Thereby, since the corner patch 30 does not inhibit the deformation of the front extension 20a, the front extension 20a can be crushed more stably and the collision energy can be absorbed.

  Further, in the present embodiment, as shown in FIG. 1, the floor tunnel 20 extends continuously from the upper and lower walls 11 through the inclined walls 12 to the floor panel 50 which is the front and rear walls, and the corner patch 30 It extends continuously from the position corresponding to the inclined wall 12 to the position corresponding to the floor panel 50. Therefore, the corner patch 30 can prevent the floor tunnel 20 from being bent backward starting from around the corner (boundary) between the inclined wall 12 and the floor panel 50 when a collision load is input to the front extension 20a. Thereby, the front extending part 20a can be crushed efficiently.

  Further, in the present embodiment, as shown in FIG. 5, the second joint portion 70 is provided rearward of the front end portion 40 a of the dash cross member 40. Thereby, since the front end portion 40a of the dash cross member 40 is positioned forward of the second joint portion 70 having high rigidity, it is possible to suppress the backward movement of the dash cross member 40 at the time of the front collision. Moreover, since the front floor tunnel 21 located in front of the rear floor tunnel 22 can be crushed intensively, collision energy can be absorbed more stably.

  Further, in the present embodiment, as shown in FIG. 3, the corner patch 30 is provided across the front floor tunnel 21 and the rear floor tunnel 22. Thereby, since relative displacement of front side floor tunnel 21 and back side floor tunnel 22 can be prevented, front side floor tunnel 21 can be crushed more stably.

  Further, in the present embodiment, the front floor tunnel 21 is formed to have lower compressive strength than the rear floor tunnel 22 against the load from the front. As a result, the front floor tunnel 21 can be deformed more easily than the rear floor tunnel 22, so that the front floor tunnel 21 can be crushed more stably.

  Further, in the present embodiment, the floor tunnel 20 is formed to be lower in strength than the dash lower panel 10 which is the front wall portion against the load from the front. Thereby, since the floor tunnel 20 deforms more easily than the dash lower panel 10, the deformation of the dash lower panel 10 can be suppressed, and consequently, the foot space of the passenger compartment 2 can be secured at the time of the front collision.

  Further, in the present embodiment, as shown in FIG. 2 and FIG. 8, the dash cross member 40 is divided into the central cross member 41 and the side cross members 42 and 42 in the vehicle width direction. And the floor tunnel 20 on the side of the passenger compartment 2. For this reason, the top surfaces of the central bead shaped portion 41d and the side bead shaped portion 42c can be joined in advance in the region where the end portions of the central cross member 41 and the side cross member 42 overlap each other at the time of assembly. Thereby, even when the dash cross member 40 has a split structure, the strength of the dash cross member 40 can be suitably improved.

  As mentioned above, although the vehicle body structure 1 which concerns on this embodiment was demonstrated in detail with reference to drawings, this invention is not limited to this, It can change suitably in the range which does not deviate from the main point of this invention.

  For example, although the dash cross member 40 is divided, it may be integrated. Further, in the present embodiment, the outer end in the vehicle width direction of the side cross member 42 reaches near the inner end in the vehicle width direction of the wheel arch-shaped portion 13 (the ridge line portion 15). It may be reached. Further, in the present embodiment, the left corner patch 30A is divided, but may be integrated. Further, in the present embodiment, the right corner patch 30B is divided, but may be integrated.

1 body structure 2 compartment 10 dash lower panel (front wall of compartment)
11 upper and lower wall 12 sloped wall 20 floor tunnel 20a front extension 21 front floor tunnel 22 back floor tunnel 23 tunnel left ridge line (ridge line)
24 Tunnel right ridge line (ridge line)
30 corner patch 30a front end 40 dash cross member 40a front end 50 floor panel (front and back wall)
60 first joint 70 second joint C1 to C3 closed cross section

Claims (7)

A dash cross member provided on the front wall of the cabin and constituting a closed cross section extending in the vehicle width direction;
A floor tunnel which is provided at the center in the vehicle width direction of the cabin and extends in the front-rear direction with a groove shape opening downward;
A corner patch extending in the longitudinal direction along the ridge of the floor tunnel outside the floor tunnel;
A first joint portion joining front end portions of the dash cross member and the corner patch;
Equipped with
The dash cross member is provided continuously from the floor tunnel toward both sides in the vehicle width direction on the cabin side of the floor tunnel.
The vehicle body structure according to claim 1, wherein the floor tunnel includes a front extension portion extending forward of the first joint portion. The forward extension extends forward of the front end of the dash cross member;
The vehicle body structure according to claim 1, wherein the front end portion of the corner patch is disposed at the same position as the front end portion of the dash cross member or behind the front end portion of the dash cross member. The front wall of the cabin is:
Upper and lower walls extending in the vertical direction,
And an inclined wall extending downward from the lower end of the upper and lower walls.
The casing includes front and rear walls extending rearward from the lower end of the inclined wall,
The floor tunnel extends continuously from the upper and lower walls through the inclined wall to the front and rear walls,
The vehicle body structure according to claim 1 or 2, wherein the corner patch continuously extends from a position corresponding to the inclined wall to a position corresponding to the front and rear walls. The floor tunnel is
Front floor tunnel,
A rear floor tunnel disposed behind the front floor tunnel;
And a second junction joining the front floor tunnel and the back floor tunnel.
The vehicle body structure according to any one of claims 1 to 3, wherein the second joint portion is provided rearward of a front end portion of the dash cross member.   The vehicle body structure according to claim 4, wherein the corner patch is provided straddling the front floor tunnel and the rear floor tunnel.   The vehicle body structure according to claim 4 or 5, wherein the front floor tunnel is formed to have a lower compressive strength than the rear floor tunnel against a load from the front. The front wall of the cabin and the floor tunnel are separately configured,
The vehicle body structure according to any one of claims 1 to 6, wherein the floor tunnel is formed to have lower strength against a load from the front than a front wall portion of the compartment. .

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